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Ho to know if fuse is burn?

Updated: 10/26/2022
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14y ago

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Determining Whether a Fuse is "Blown" or Not

I do this by one of two methods. First, one must understand how a fuse works.

A fuse, whether is has a glass "envelope" or a plastic envelope, is nothing more than two electrical contacts [one at each end] with a small, sometimes tiny, conductor [wire or very small bar of metal] connecting between the two contacts.

The tiny conductor is the "working" part of the fuse; IF the electrical current flowing through the fuse is too much for the wire protected by the fuse to safely carry, then the tiny, thin "fusible" filament overheats, and melts thus, like opening a switch, cutting off the flow of electricity.

Usually, when a fuse blows, the electrical arc which melts the link, causes a black or grey, "smokey" deposit on the inside of the envelope. If that's the case, then you can usually see, and know, that the fuse has blown.

Sometimes, a fuse will blow, without causing the black, smokey deposit, and we have to use another method to determine that the fuse has blown.

The next way to tell if a fuse is blown is to carefully [sometimes a magnifying glass helps] examine the tiny wire or bar, looking to see if it's completely intact/continuous, OR IF is "cut" or "burned" in two. IF it's not continuous, then the fuse is blown and ruined.

A third method is to use a Volt-Ohm Meter [VOM] set to a low resistance [Ohms] scale. Connect one of the test probe points to one contact of the fuse, and the other test probe to the other contact. IF the meter needle does not move [or with a digital meter, shows all zeros] then that is an indication the the fuse is blown, and thus ruined.

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